Lithium-ion battery assembly process and technology

Battery assembly process and technology According to the structural design and design parameters of lithium-ion batteries, how to prepare selected battery materials and effectively combine them to assemble a battery that meets the design requirements is a problem to be solved in battery production technology. It can be seen that whether the battery production process is reasonable is the key to whether the assembled battery meets the design requirements, and it is also the most important step that affects the battery performance. With reference to the production process of AA-type Cd/Ni and MH/Ni batteries, combined with the structural design of AA-type lithium-ion batteries and the performance characteristics of lithium-ion battery materials and repeated tests, the production process of AA-type lithium-ion batteries is determined. The production process of AA lithium-ion battery includes four processes: (1) preparation of anode and cathode plates; (2) winding of cells; (3) assembly; (4) sealing. This is not much different from the traditional AACd/Ni battery production process, but lithium-ion batteries are technically much more complicated and require much higher environmental conditions. Lithium-ion battery manufacturing technology is very strict and complex. The manufacturing parameters of the graphite/LiCoO2 cylindrical lithium-ion battery are listed in the table. Among them, the preparation of positive and negative electrode pastes, positive and negative coating electrode sheets, drying, rolling preparation technology and winding battery have the greatest impact on battery performance, and the most critical step is the manufacturing technology of lithium-ion batteries. These processes are briefly described below. In order to prevent the safety problems caused by the negative mass flow of lithium metal deposited on the copper part, it is necessary to improve the electrode process, and both sides of the copper foil must be coated with carbon paste. The important process flow of lithium ion battery is as follows. (1) When using special solvents and adhesives to make the slurry, mix it with the positive and negative active material powders and stir evenly at high speed to form a positive and negative active material slurry. During coating, the slurry is uniformly coated on the surface of the metal foil, and after drying, the positive electrode and negative electrode plates are respectively made. (3) The sequence of the assembly of the positive plate is arranged, the diaphragm, the negative plate and the diaphragm are from top to bottom. The battery is made of windings, and then through the injection of electrolyte, sealing and other processes, that is, after the battery assembly process is completed, the battery is made into a finished product . (4) Enter the factory and use special battery charging and discharging equipment to conduct charge and discharge tests on finished batteries, test each battery, screen qualified finished batteries, and leave the factory. Design requirements. Since 18650, the lithium-ion battery case has been selected as AA type (∮14mm×50mm). The battery structure design mainly refers to the design of the battery cover, the sealed assembly of the battery, the size of the electrode, and the size of the upper air chamber. The ratio of the battery and the substance at the two poles Whether their design is reasonable will directly affect the internal resistance, internal pressure, capacity and safety of the battery. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Lithium-ion battery test equipment method